On Thu, Sep 06, 2007 at 04:01:30PM -0400, Mathieu Desnoyers wrote:
<snip>
> @@ -716,8 +720,9 @@ static int __kprobes pre_handler_kretpro
> struct kretprobe_instance, uflist);
> ri->rp = rp;
> ri->task = current;
> + kernel_text_lock();
> arch_prepare_kretprobe(ri, regs);
> -
> + kernel_text_unlock();
pre_handler_kretprobe() is run when the entry probe for a retprobed
function is hit and cannot block. You can't take a mutex here.
And why do we need to take the kernel_text_lock() here anyway? All
arch_prepare_kretprobe() does is modify the return address stored either
on stack or a register (arch specific) to the trampoline. We don't
change any kernel text here.
Ananth
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